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Renal failure as first manifestation of familial sarcoidosis

E. Pastor, J.M. Arriero, A.I. Gutiérrez, M.E. Barroso, R.J. Noguera, C. Muñoz, M.L. Porriño
European Respiratory Journal 2010 36: 1485-1487; DOI: 10.1183/09031936.00077710
E. Pastor
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J.M. Arriero
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A.I. Gutiérrez
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M.E. Barroso
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R.J. Noguera
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C. Muñoz
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M.L. Porriño
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To the Editors:

Sarcoidosis is a systemic illness of unknown origin characterised by the presence of epithelioid, noncaseating granulomas in multiple organs, most commonly the lungs, eyes and skin. Renal disease is uncommon; however, it is an indication to perform a diagnostic and prognostic renal biopsy, and to put the patient on treatment with high and prolonged steroid doses. The presence of several cases in the same family is well known, as is the association with other chronic inflammatory disorders, favouring a genetic, environmental and/or immunological aetiology 1.

We report a case of a 40-yr-old male referred to the nephrologist because of high levels of creatinine. He had been a 5 pack-yr smoker until 8 yrs previous and had worked as a salesperson in a large store. Except for mild asthenia, polyuria and polydipsia, he remained asymptomatic. Physical examination was entirely normal. Abdominal ultrasonography showed bilateral nephrocalcinosis and spleen enlargement, and the patient was admitted for further evaluation. Red and white blood cell counts were normal. Serum chemistry showed the following (normal ranges in parentheses): creatinine 3.2 mg·dL−1 (0.7–1.3 mg·dL−1); calcium 13.5 mg·dL−1 (8,2–10,6 mg·dL−1); 1,25-dihydroxyvitamin D 62,2 ng·dL−1 (10–50 ng·dL−1); parathyroid hormone 8.7 pg·mL−1 (11–72 pg·mL−1); angiotensine converting enzyme 178 IU·L−1 (18–55 IU·L−1); and 24-h urine calcium excretion 976 mg·day−1 (10–300 mg·day−1). Thyroid hormone levels, immunoglobulin (Ig) levels and antigliadin IgA levels were normal. Chest radiography showed bilateral diffuse interstitial infiltrates and a high-resolution computed tomography scan further showed hilar, mediastinal and axilar adenopathy. There were interlobar septal thickening and peripheral and subpleural small nodules related to pulmonary vessels. A 2-IU purified protein derivative RT-23 test showed no induration after 72 h. The ECG was normal, as was the ocular exam. Pulmonary function test results were as follows: forced vital capacity (FVC) 4,670 mL (94% predicted); forced expiratory volume in 1 s (FEV1) 4,110 mL (100% pred); FEV1/FVC 88% (110%); single-breath diffusing capacity of the lung for carbon monoxide 66%; and transfer coefficient of the lung for carbon monoxide 80%. Fibreoptic bronchoscopy was normal. Bronchoalveolar lavage showed 44% lymphocytes (CD4+ 86 %, CD8+ 12% and CD4+/CD8+ 7%) and transbronchial biopsy revealed noncaseating granulomas with negative Lowenstein cultures. A renal biopsy was also performed, showing sclerotic changes affecting 50% of glomeruli, and interstitial fibrosis and granuloma. The patient was treated with saline solution, calcitonin, bisphosphonates and 0.5 mg·kg−1 prednisone per day. At discharge, serum creatinine was 2.2 mg·dL−1 and the patient was diagnosed with stage II thoracic, renal and splenic sarcoidosis with chronic renal failure due to interstitial nephritis and hypercalcaemia. A familial history was elicited (fig. 1). He had eight female siblings, one of whom had been diagnosed with sarcoidosis and coeliac disease. Two other siblings also had coeliac disease. A female cousin had been diagnosed with sarcoidosis with ocular, thoracic and central nervous system disease and Graves’ disease. Pulmonary transplantation had been performed on another of his cousins due to “lung fibrosis”. Ulcerative colitis was present in yet another cousin and his grandmother had died of lung disease at a young age. Prednisone was tapered and suppressed after 1 yr of treatment but had to be reinstituted because of clinical and analytical worsening. 2 yrs after diagnosis, serum creatinine levels were 2.2 mg·mL−1, while the patient was still receiving 5 mg of prednisone every other day.

Figure 1–
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Figure 1–

The patient’s family tree showing confirmed and possible cases of sarcoidosis (Embedded Image), coeliac disease (Embedded Image), Graves’ disease (Embedded Image) and ulcerative colitis (•). #: died of pulmonary disease at 60 yrs of age; ¶: pulmonary transplantation at 45 yrs of age because of “pulmonary fibrosis”.

Renal disease is uncommon in sarcoidosis and usually diagnosed after lung disease is already evident. Renal granulomas are found in 15–40% of necropsies but renal dysfunction due solely to granulomas is considered a rare clinical finding. Three forms of renal involvement, namely, nephrocalcinosis, interstitial nephritis and glomerulonephritis, may cause renal failure. Nephrocalcinosis and nephrolithiasis, the most common causes of renal failure, are the result of an enhanced activation of 1α-hydroxylase in sarcoid granulomas, increasing the levels of endogenous calcitriol, causing hypercalcaemia and hypercalciuria. Up to 10% of patients with sarcoidosis have hypercalcaemia. Hypercalciuria is much more common, with an estimated frequency up to 30–40%. Interstitial inflammation, and occasionally fibrosis, in the absence of granuloma and nephrocalcinosis, have been noted in patients with sarcoidosis and renal failure, resulting in renal dysfunction from the activation of cellular immunity in renal tissue 2. Glomerular disease, a less frequent cause of renal insufficiency, has been described as membranous glomerulopathy, proliferative glomerulonephritis and IgA nephropathy. Enhanced production of Igs may be involved in the pathogenesis of membranous glomerulonephritis, but neither antigen nor specific antibodies have been identified in glomerular immune deposits. Although steroid treatment is useful in any histological form of renal involvement, because renal relapse of sarcoidosis has been reported under a low-dose regime, the presence of interstitial nephritis is an indication of higher and prolonged doses of these drugs 2. In fact, in the patient described here, prednisone had to be reinstituted after tapering because of clinical and analytical worsening. In rare cases, even treated renal disease progresses and dialysis or renal transplantation have to be performed.

The presence of several cases of sarcoidosis in the same family is a well-known occurrence. Since the first report in 1923, a total of nearly 450 cases had been presented worldwide up to 2000 3. By 1971, 80 cases had been reported in 35 families but only three with more than two relatives affected. The patient here described had two confirmed cases of sarcoidosis in his family, a sister and a cousin, one of them previously reported. His grandmother died at the age of 60 yrs of an undefined pulmonary disease. A lung transplantation had been performed on another cousin because of “pulmonary fibrosis” of unknown aetiology, representing two other possible cases of sarcoidosis (fig. 1). Recently, a case–control aetiological study of sarcoidosis has shown a familial relative risk of 4.7 (95% CI 2.3–9.7) 4. That study showed that siblings have the highest relative risk, followed by avuncular relationships, grandparents and parents. The fact that the overall familial relative risk in siblings was larger than that in parents suggested either a recessive mode of inheritance with incomplete penetrance or a shared environmental effect 4. Moreover, a recent study based on the ACCESS (A Case–Control Etiologic Study of Sarcoidosis) data set has suggested that sarcoidosis is due to an interaction of factors, including genetic predisposition and environmental exposure, in at least some cases of sarcoidosis 5. In a review of literature, we have found that human leukocyte antigen (HLA) genotypes DR 11, 12, 13, 14, 15 and 17 have been reported to confer susceptibility to the disease, HLA DRB1 and DQ B1 have been associated with acute sarcoidosis and a good prognosis, and HLA A1, B7, B8, B13, DR3, DR5, DR14, DR15 and DRl7 with familial cases 1, 6. A specific association between sarcoidosis and a variant of the butyrofilin-like 2 (BTNL2) gene has recently been described 7. Clinical manifestations do not differ between sporadic and familial cases. In the same way, familial sarcoidosis does not imply a worse prognosis, with several reported cases in whom treatment is not required but spontaneous remission happens. Although the ACCESS study showed that siblings of patients with sarcoidosis are at increased risk of the disease, the phenotypic features and clinical outcomes exhibit minimal concordance, with the exception of eye and liver disease 6.

The association between immune-mediated and chronic inflammatory diseases and sarcoidosis has been described in case series. This association does not occur by chance, as a recent report establishes 8. In that report, when all immune-mediated and chronic inflammatory diseases for which associations were sought were combined, the overall rate ratio associated with sarcoidosis was 2.2 (95% CI 1.9–2.6). Of these “overlap syndromes”, Graves’ disease, ulcerative colitis and coeliac disease have already been linked to sarcoidosis. Interestingly, antigliadin and antiendomysium antibodies have been found in patients with sarcoidosis, whether coexisting or not with coeliac disease 9. A significantly higher prevalence of Graves’ disease of clear autoimmune origin has been reported in female sarcoidosis patients compared with a large group of control subjects. In that report, thyroid function tests and ultrasonography were recommended as routine in female sarcoidosis patients 10. Although it was not possible to perform either these tests or a genetic study in his siblings, we did not find a positive titre of antigliadin antibodies in this patient; nor we did find abnormal thyroid hormone levels. However, three siblings of our patient had coeliac disease, coexisting with sarcoidosis in one of them. In addition to this, one if his cousins had Graves’ disease and another had ulcerative colitis, suggesting a genetic or environmental link with all these overlap syndromes.

In summary, if high levels of creatinine are found in a patient with hypercalcaemia and/or hypercalciuria, sarcoidosis must be excluded. In the same way, if high levels of creatinine are found in a patient with sarcoidosis, renal biopsy is mandatory to prove renal disease and its type. When sarcoidosis is suspected, we believe that the initial evaluation should include thyroid function tests, and assays for antigliadin and antiendomysium antibodies. Based on the familial case presented here and other previous reports, a careful familial history should be obtained, including symptoms suggesting sarcoidosis and other immunological and inflammatory diseases.

Footnotes

  • Statement of Interest

    None declared.

  • ©ERS 2010

REFERENCES

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Renal failure as first manifestation of familial sarcoidosis
E. Pastor, J.M. Arriero, A.I. Gutiérrez, M.E. Barroso, R.J. Noguera, C. Muñoz, M.L. Porriño
European Respiratory Journal Dec 2010, 36 (6) 1485-1487; DOI: 10.1183/09031936.00077710

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Renal failure as first manifestation of familial sarcoidosis
E. Pastor, J.M. Arriero, A.I. Gutiérrez, M.E. Barroso, R.J. Noguera, C. Muñoz, M.L. Porriño
European Respiratory Journal Dec 2010, 36 (6) 1485-1487; DOI: 10.1183/09031936.00077710
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